KITTIWAKE ( MMSI 232008570) is a Pilot and currently sailing under the flag of United Kingdom (UK) Here she is speeding down the River this morning.

Vessel name: Polaris ; Year built: 2012 ; Flag: Netherlands ; Homeport: Rotterdam Length: 81.2m X 13.3m ; GRT: 2501 ; Callsign: PBZN ; MMSI:245142000 ; IMO: 9496915 Type: Special Vessel / Pilot Ship A "Pilot Ship / Pilot Vessel" is a "special type" of ship in which it accommodates a certain and limited Marine Pilots (Sea, River, Harbor Pilots), it also carries small boats/crafts that are used to tender services to and from the Pilot ship. In a Pilot Vessel, the Pilots can take their time...

Day two at the offshore Pilot station out of San Francisco. https://instagram.com/sea_weathered?igshid=YmMyMTA2M2Y=

This is how a ship Pilot boarding a vessel in calm seas.

The pilot for the port of Cairns jumping off the pilot boat and getting onto the cruise ship. 
Carnival Luminosa December 2024 

"A performance assessment tool for maritime pilotage operations" - by Jørgen Ernstsen, Norway
When the ship is approaching or leaving a port, a local navigational expert, the pilot, is often provided for assisting the bridge team to safely and efficiently navigate the littoral waters.

These are various views of the pilot vessels coming and going from the pilot dock in Vlissingen prior to 2020.

The Swedish Maritime Administration is launching the world's first fully methanol-powered pilot boat today, It is one of the ministry's existing pilot boats, which has now been converted to test the new propellant. The work is part of the Swedish Maritime Administration's transition to a fossil-free fleet.